mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
58 lines
2 KiB
C
58 lines
2 KiB
C
|
/* $NetBSD: cpow.c,v 1.1 2007/08/20 16:01:35 drochner Exp $ */
|
||
|
|
|
||
|
|
/*-
|
||
|
|
* Copyright (c) 2007 The NetBSD Foundation, Inc.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* This code is derived from software written by Stephen L. Moshier.
|
||
|
|
* It is redistributed by the NetBSD Foundation by permission of the author.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* 1. Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
||
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
||
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
||
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "../src/namespace.h"
|
||
|
|
#include <complex.h>
|
||
|
|
#include <math.h>
|
||
|
|
|
||
|
|
double complex
|
||
|
|
cpow(double complex a, double complex z)
|
||
|
|
{
|
||
|
|
double complex w;
|
||
|
|
double x, y, r, theta, absa, arga;
|
||
|
|
|
||
|
|
x = creal(z);
|
||
|
|
y = cimag(z);
|
||
|
|
absa = cabs(a);
|
||
|
|
if (absa == 0.0) {
|
||
|
|
return (0.0 + 0.0 * I);
|
||
|
|
}
|
||
|
|
arga = carg(a);
|
||
|
|
r = pow(absa, x);
|
||
|
|
theta = x * arga;
|
||
|
|
if (y != 0.0) {
|
||
|
|
r = r * exp(-y * arga);
|
||
|
|
theta = theta + y * log(absa);
|
||
|
|
}
|
||
|
|
w = r * cos(theta) + (r * sin(theta)) * I;
|
||
|
|
return w;
|
||
|
|
}
|